The Illumar Feedback Buttons are buttons added by Project Red as from version 4.4.4 (MC 1.7.2). These can be used like the buttons from Vanilla and transmits a redstone signal, but light up for the time of activation. The Illumar Feedback Buttons have two different properties that distinguish them from the Illumar Buttons:
The Illumar Feedback Buttons light up when a Illumar Button is activated on the same block, but not vice versa. Also the secondary activated Illumar Feedback Button transmits a redstone signal over redstone, but not red alloy cables.
The Illumar Feedback Buttons light up when a redstone signal reaches the buttons but only over redstone, not red alloy cables.
The Illumar Feedback Buttons can be placed on blocks like wood, stone or machines and can be connected to red alloy wires or redstone.
There are 16 colors for the Illumar Feedback Buttons (see below).